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Photo response of Dy 164

Publication ,  Journal Article
Papst, O; Werner, V; Isaak, J; Pietralla, N; Beck, T; Bernards, C; Bhike, M; Cooper, N; Crider, BP; Friman-Gayer, U; Kleemann, J; Löher, B ...
Published in: Physical Review C
September 1, 2020

Background: Little data is available for the pygmy dipole resonance (PDR) in axially deformed nuclei. Photon-scattering experiments are complicated by high level densities in the PDR region and the small energy difference of transitions to the ground state and to excited states.Purpose: We report on an experimental study of the low-energy dipole strength distribution of the well-deformed nucleus Dy164 between 4.0-7.7 MeV. Methods: The low-lying photoresponse of Dy164 has been investigated using the method of nuclear resonance fluorescence using a quasimonochromatic linearly polarized γ-ray beam in the energy range of 4.0-7.7 MeV in steps of 0.2 MeV. Results: For excitation energies between 4 MeV and 5 MeV, sufficiently low level densities allow for the identification of individual states, including level energies, reduced transition widths and branching ratios. Energy-averaged mean decay branching ratios, mean population ratios and partial absorption cross sections were determined above 5 MeV up to the neutron-separation threshold at 7.7 MeV. A Lorentzian-shaped enhancement of the partial photo absorption cross section followed by decays back to the ground-state band is found at 6.10(5) MeV with a width of 0.77(23) MeV. A comparison with results from complementary measurements is performed using the framework of the statistical model. Conclusions: The experimental results for the mean population ratios deviate systematically from the statistical model simulation by 30(6)%. However, they are in agreement within one standard deviation of the simulation.

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Published In

Physical Review C

DOI

EISSN

2469-9993

ISSN

2469-9985

Publication Date

September 1, 2020

Volume

102

Issue

3

Related Subject Headings

  • 5106 Nuclear and plasma physics
 

Citation

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Papst, O., Werner, V., Isaak, J., Pietralla, N., Beck, T., Bernards, C., … Vanhoy, J. R. (2020). Photo response of Dy 164. Physical Review C, 102(3). https://doi.org/10.1103/PhysRevC.102.034323
Papst, O., V. Werner, J. Isaak, N. Pietralla, T. Beck, C. Bernards, M. Bhike, et al. “Photo response of Dy 164.” Physical Review C 102, no. 3 (September 1, 2020). https://doi.org/10.1103/PhysRevC.102.034323.
Papst O, Werner V, Isaak J, Pietralla N, Beck T, Bernards C, et al. Photo response of Dy 164. Physical Review C. 2020 Sep 1;102(3).
Papst, O., et al. “Photo response of Dy 164.” Physical Review C, vol. 102, no. 3, Sept. 2020. Scopus, doi:10.1103/PhysRevC.102.034323.
Papst O, Werner V, Isaak J, Pietralla N, Beck T, Bernards C, Bhike M, Cooper N, Crider BP, Friman-Gayer U, Kleemann J, Krishichayan, Löher B, Naqvi F, Peters EE, Prados-Estévez FM, Ilieva RS, Ross TJ, Savran D, Tornow W, Vanhoy JR. Photo response of Dy 164. Physical Review C. 2020 Sep 1;102(3).

Published In

Physical Review C

DOI

EISSN

2469-9993

ISSN

2469-9985

Publication Date

September 1, 2020

Volume

102

Issue

3

Related Subject Headings

  • 5106 Nuclear and plasma physics